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Finding the Fourth Proportional to 718.55, 1,078.13 and 393.54

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Solution

The fourth proportional to 718.55, 1,078.13 and 393.54 is: 590.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.55 : 1,078.13 = 393.54 : x
  2. Step 2: Convert to fraction form
    718.55/1,078.13 = 393.54/x
  3. Step 3: Cross multiply
    718.55x = 1,078.13 × 393.54
  4. Step 4: Simplify right side
    718.55x = 424,287.28
  5. Step 5: Solve for x
    x = 424,287.28/718.55
  6. Step 6: Final answer
    x = 590.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.